Typewriting machine



' May 1, 1923.

F. H. ARMSTRONG TYPEWRITING MACHINE Filed Dec. 27, 1918 2 Sheds-Sheet 1 F. H. ARMSTRONG TYPEWRITING MACHINE FiledDec. 27. 1918 ZSheets-Sheec 2 w ig patented May 1, 1923 rennin HURBERT nn rs'ritone, OFVAUBURN, nnwyoamnssrenon' o ooRonA TYPE- WRITER ooMrANY In OF GBO'1ON,1\TEW YORK, A CORPORATION, or NEW YORK.

TYPEWRITING IVIACHINE.

' Application filed December 27, 1918. SerialNo. 268,579.

To all whomz'zf may concern: p I

Be it known that I, FRANK H. ARMSTRONG, a'oitizen of the United Statesrof America, and a resident of Auburn, countyof Cayuga, State of New York, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a full and clear specification.

This invention has relation to that type of paper-"feeding means broadly covered in my copending'applioation Serial No. 256,195, filed September 30, 1918. I

Fig. 1'is a perspective view of a portion of a paper-feeding appliance embodying my invention;

Fig. 2 is a plan view of a paper-feeding bappliancefiembodying the same structure partly il'lustratedin Fig. l; Fig; 3 is a perspective view of one of the bars which support the front feed roll shafts; I

Fig. 4 is a perspective view ofthe-swinging frame oarryingthe rear feed roll-shaft; Fig. 5 is a vertical 'sectional view on the line 5-5 of Fig. 2, bothfront and rear feedrolls being shown in operative position;

Fig. 6 is a similar view on the line 6-6 of Fig. 2, the rear feed-rolls being swung to release position;

Figs. 7, '8, 9, 10,11, 12 and-13 are detail views showingmodifications.

Referring to the drawings annexed by referencecharacters, lsfdesignates a rockshaftjournaled in'the usual end flanges 1 9 of the platen-carriage at a point to the rear of the platen and approximately on a levelwith the spacebetween the platen and the carriage 20. This rock-shaft isadapte'd to be rocked forwardly a limited distance'by any suitable mechanism operable manually; I prefer for thispurpose a forwardly-extending arm 21- adapted to be held in its up position by spring 22 against one edge of a oam-lever-23 pivotallymounted on the shaft 24 of the platen and adapted when rotated forwardly to swing the arm 21 downwardly it-predetermined distance "and to lock it in that position. 1 i

The front paper-feed idevices consist of two U-shaped frames, each of which consists of a pair of flat bars {25 carrying at their forward ends a shaft .26 on which is mounted two front feed-rolls '27, these rolls being spaced apart onysaid shaft'by aloosejsleeve .28. The rear ends of the bars25, are pivotally hung upon the rock-shaft 18 byfmeans of a pairo-f upwardly-bent hooks 29 formed on the rear ends of the bars25, which hooks engage over the topside of the shaft, and

a pair. of rearwardly-extending .fingers30 engaged unoler the shaft, the rear'ends of, bars 25 being laterally-broadened to ensure a. broad bearing on the shaft, to ,thereby avoid undue lateral swinging of the front ends of theearrier-bars 25.

The rear paper. feed devices consist of two frames each of which comprises a feed-roll] shaft 32 journaled in the forward ends. of

two arms 33 pivotally connected at theirrear ends to therock-shaft 18, a pair of feed rolls 31 being loosely mounted onyshaft 32and said arms 33 being provided with integral 1 fingers 34 bent so as tohavetheir forward extremities in axialalinementwith the shaft 32 and thus act asshaft-stops to prevent undue endwise movement of the shaft. in the bearing-arms 33.

The rear feed-rolls 31on each shaft 32 are spaced apart by a pair of separated upstand ing lugs 35 carried at the rear end of the bar 36 whose'forward end bears upwardlyagainst the spacing sleeve 28. Asuitable spring mechanism is arnnged to bear upwardly' against the two e ualizing bars or levers 36 to thus normal y or resiliently press all of the feed-rolls against the platen.

Fig. 2 I show a double flat spring 37 for this purpose, this'spring extending longitudinally of the carriage and beingfastened.

about midway its length to the top-face of the carriage and having its free ends hearing; respectively up against the bars 36.;

The end-bar's 25 are approximately'on a '3 level with the'under side-of the rock-shaft 18, while the carrier-arms 33 for the rear feed-roll-shaft 32;project" forwardly in a higher plane, so thatthe axis of said shaft 32 is ina plane above the r0ck shaft and the under side of the rear feed-rolls 31 are ap proximately on a level with the upper side of the end-bars 25. The two carrier-arms 33 for each rear feed-roll shaft are connect- .ed together at'their rear ends by a baror plate 38 "so that the arms 33 will swing in tappets which normaly lie against the sufficient space between the lugs 41 to allow a limited play of the rear feed roll supports, to thus give a limited free play to the rear feedrolls', to enable them to readily accommodate themselves to work-sheets of difierent thicknesses, inequalities of platen surface, etc. The two supporting frames for the front feed-rolls are held against undue endwise movement with respect to the rock-shaft 1S and the platen by so attaching the arms 33 to the rock-shaft that their rear depending ends shall extend downwardly between the separated fingers or lugs 30 carried by the carrier-bars 25, the space between these lugs, however, being a sufficient degree wider than the engaging part of the bar to permit the front roll supports to have a slight endwise play with respect to the rock-shaft, to thereby enable said front roll supports and the rolls carried thereby to have a sort of universal-adjustment capacity with respect to the platen surface.

It will be observed that through the mediumof the bars 36, both the front and the rear feed-rolls will be held resiliently against the platen and that the supports or carriers of these rolls are so constructed and arranged that these rolls shall not only he capable of yielding independently away from the platen, but shall also have a limited skewing capacity as well as a capacity to shift slightly endwise with respect 'to the platen, thereby ensuring at all times proper frictional action against thefwork-sheets, irrespective of inequalities of platen, thickness of paper and presence of -erasure-rubbings and other foreign matters that might lodge between the sheets and the platen. When the rock-shaft is rocked forwardly to release, the feed-rolls from the platen, this being done through the medium of the camlever 23 or other suitable means, the first action will be to swing the rear feed-rolls away from the platen, this being done through the medium of the tappets or arms 40 which engage the top-side of the connecting bars 38 and swing the rearfeed roll shafts 32 downwardly. During this initial downward movement of the feed roll shafts 32, no movement of thefront feed-roll-struture takes place, but at a predetermined point in the downward movement of the rear feed-rolls, the front edges of the bars 38 will engage the top-sides of the end-bars 25, as shown in Fig. 6, and thus lock the endbars to the rock shaft so that a thither rotation of the rock-shaft will pry or swing down the forward ends of the end-bars and thus take all of the front near-en' away from the platen the desired distance. Insteadof the spring 37 I may employ two spring-actuated levers 43 for pressing upwardly on bars 36, as shown in Figs. 7 to 12. The pivotal connection of the levers 43 to the platen-carriage. may be by wayof a pair of integral lugs 45 formed on each lever and arranged to extend through openings formed in the carriage-plate 20, as shown in Figs. 10 and 11, or by striking iip a pair of lugs 46 from the carriage-plateand having theselugs engage notches in,th'e ends of a broad bearing-plate, 47...,formed integral ,with the l'eve'r,,as shown in Figs. Band 13. With each ofthese ways of connecting the levers to lthje platen carriage, it will be, observed that I avoid the use of pivots or other parts requiring machining. The forward ends of levers 43 engage nnder the bars 36 and the rear ends of the levers are normally pulled downward by springs 44 connected at their ends with the levers and platen carriage.

In Figs. 7 8 and 9,- I'shjow another way of connecting the carriers 33to the rockeshaft. In this modified form of the device, it ,will be observed that I do away with tl ielong connecting-bar 38, using instead a short lateral bar or flange48 formed integral with the bar-like carrier. 33 and having its end connected to the, rock-shaft by a re arw'ardly extending ear 49, to thu's pro-vide. for each carrier 33 a broad and substantial "connection with the rock-shaft lyiththisarrangement, it is desirable that instead of one tappet 40 for each rear roll shaft supporting frame, I employ four of these tappets, one being arranged toengage each one of the short bars or plates 48, each of, these tap-pets being arranged toengagebetween the fingers 30 of the end-bars 25 inthe same a manner as that in which said fingers arle engaged in the ;other structure by. ineans of the rear ends of the carriei' arms 33.. operation of this modified structure is the same as in the/ structure in which the long bars 38 e e ploy dh u id s'c pe' the in ent e having been thus indicated and its preferred embodiment having been specifically described, what is claimed new is I I 1: I a P p r d mec ani m he e h n'ation of 'a platen, a rockable castf-Tolf means for rocking said east-off Shain pnepiece sheet metal feed-roll frame pivoted directly to the'cafst-ofi shaft to swing -about the cast oif shaft when said shaft is stationy P ov d d w thbe f t Jam roll shaft, a tappeton the c'as'; -ofi shaft ad apted tofengage 'and swing-te frame away from the platen when shaft is rocked in one direction, lugs on the frame at opposite sides of the tappet, means for yieldably urging the frame toward the platen, a feedroll shaft extending through the bearings on the frame, a feed-roll loosely mounted on the feed-roll shaft between said bearings, and integral bendable stops on the frame bendable'into alignment with the ends of the feed-roll shaft for holding the shaft in the frame. v I

' 2. A feed-roll mount comprising a flat sheet metal member having end portions bent at right angle thereto to form shaft' supports, said end portions being provided with apertures, a feed-roll shaft having its ends extending through said apertures, a

feed-roll looselymounted on said shaft between said end portions, and bendable stops formed on said end portions and bent into alinement with the ends of the shaft to prevent endwise withdrawal of the shaft from said end portions and spaced slightly from the ends of the shaft. j i

3. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a cast-off rock shaft journalled on the carriage, a frame pivotally held at its rear edge to the rock shaft, a rear feed roll shaft supported at its ends in said frame, a front feed roll shaft, feed rolls on the feed roll shafts, a pair of independent members pivotally'held at their rear ends to the rock shaft and each provided adjacent its forward end with a bearing for one end of thefront feed roll shaft,

and means whereby the feed rolls will'be tion of a platen carriage, a platen rotatably' mounted on the carriage, a cast-off rock shaft ournalled on the carriage, a frame pivotally held at its rear edge to the rock shaft, a rear feed roll shaft supported at its ends in said frame, a front feed roll shaft, feed rolls on the feed rollshafts, a pair of independent members'pivotally held attheir rear ends to the rock shaft and each pro vided adjacent its forward end with a hearing for one end of the front feed roll shaft, means for yieldably pressing the feed-roll shafts toward the platen, and means whereby the rear feed roll shaft will be shifted away from the platen in advance of the front feed roll shaft when the rock shaft is rotated in one direction.

5. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a cast-off rock shaft journalled on the carriage, a frame pivotally held at its rear edge to the rock shaft, a rear feed roll shaft supported at its ends in said frame, a front feed roll shaft, feed rolls on the feed roll shafts, a pair of independent members pivota-lly held at their rear ends to the rock shaft and each provided adjacent its forward end with a bearing for one end-of the front feed-roll shaft, means for pressing both feed roll the rear feed roll shaft supporting frame away from the platen, said'frame being shafts toward the platen, anda tappet on I the rock shaft adapted to engage andswing adapted to engage and swing the front shaft supporting'members away from the ofthe frame. 6. In a typew'riting machine, the combination of aplaten carriage, a platen rotaplaten after an initial cast-off ino-vement tably mounted on the carriage, a cast-off rock shaft journalled on the carriage, "a frame pivotally held at its rear edge tothe rock shaft, a rear feed roll shaft supported their rear ends to the rock shaftand each provided adjacent its forward end with a bearing for one end of the front feedro-ll shaft, a bar extending transversely of the carriage and pressing upwardly against botli feed roll shafts, a spring pressing upwardly against said bar, and means on the rock shaft for swinging the rear feed roll shaft supporting frame away from the platen, said frame'being adapted to engage and swing the front roll shaft supporting members away from the platen. i, a

7. In a typewriting machine, the combination of aplaten carriage, a platen ro-' tatably mounted on the carriage, tandem feed rolls, independent supporting means for the rolls both located at the same side ofthe rock shaft and connected atone end to the rock shaft to swing freely about said shaft and slide longitudinally of the shaft, and a tappet on the rock shaft for i-rockingthe supporting means for one of the feed, roll shafts away from the platen, said independent shaft supporting means being interlocked with each other at their points of connection with the shaft to limit relative movement 'therebetween longitudinally of the shaft and said tappet being interlocked with the supporting means of oneof saidshafts' to thus limit the sliding movement of the two supporting means on the rock shaft, the i supporting means rocked by the tap-pet being I adapted to engage and rock the other roll supporting means.

8. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, tandem.

feed rolls, independent supporting means for the rolls both located at the same side of the rock shaft and connected at one end to the rock shaft to swing freely about said shaft and slide longitudinally of the shaft, and a tappet on the rock shaft for rocking the supporting means for one of the feed roll shafts away from the platen, saidindependent shaft supporting means being interlocked with each other at their points of connection with the shaft to limit relativemovement there between longitudinally of the shaft and said tappet being interlocked with the support ing means for one of said shafts to thus limit the sliding movement of the two supporting means on the rock shaft, the supporting means rocked by the tappet being adapted to engage and rock the other roll support-- ing means, a member for pressing both rolls toward the platen, and resilient means for exerting pressure on said member.

9. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a cast-off roclr shaft journalled on the carriage, a rear feed roll shaft, supporting means for the rear feed roll shaft pivotally held to the rock shaft, a front feed roll shaft, bars supporting the front feed roll shaft at the same side of the rock shaft as the rear feed roll shaft and provided at one end with hooks engaging over the rock shaft and fingers engaging under the rock shaft, feed rolls on the feed roll shafts, means on the rock shaft for rocking the rear feed-roll shaft supporting means away from the platen into engagement with the bars to successively cast ofi the rear and front rolls, and means for normally urging the rolls toward the platen.

10. In a paper feed mechanism, the combination of a platen, a rock shaft, means for rocking said shaft, a rear feed-roll frame having a longitudinal member and roll-shaft supporting end members pivoted on the rock shaft, a rear roll shaft supported on said end members, a tappet on the rock-shaft en gaging over said longitudinal member of the rear roll frame, a front feed-roll shaft, supporting means for the front feed roll shaft normally spaced below the longitudinal member of the rear roll frame and pivotally held to the rock shaft, and feed-rolls on the front and rear roll and shafts.

11. In a paper feed mechanism, the comshaft normally spaced below the longitudi-s nal member of the rear roll frame and pivotally held to the rock shaft, feed-rolls on the front and rear roll shafts, and spring-urged means independently pressing the front and rear roll shafts toward the platen.

12. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a pair of aligned rear feed roll shafts, a pair of aligned front feed roll shafts, a pair ofspaced feed rolls on each shaft, a pair of pressure distributing members each connected with two tandem feed roll shafts intermediate the rolls on the shafts, and a bowed spring on the carriage having its ends connected with said members.

13. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a pair of aligned rear feed roll shafts, a pair of aligned front feed roll shafts, a pair of spaced feed rolls on each shaft, a cast off rock shaft on the carriage, independent supporting means for each shaft pivotally held to the rock shaft, means on the rock shaft for swinging the supporting means for the rear shafts away from the platen intoengagement with the supporting means for the front shafts, a bowed spring secured midway its ends to the carriage, and a pair of bars resting on said spring at opposite sides of its iongitudnal center and each connected with a front feed roll shaft and a rear feed roll shaft intermediate the rolls on said shafts.

This specification signed this seventeenth 

